How exactly will you check if the address is indeed held by Binance? Why do you want Binance address specifically. Did you mean to say "Bitcoin address"?
I am still confused how he will verify this. He may wait until the coins are withdrawn from Binance wallet to the cold storage, which is often registered by Binance and can easily checked.
If you got bitcoin with +6 confirmations, this does not mean that you are safe, as your Binance account is linked to your KYC, and this person may be trying to link his bitcoins to another account to hide his crime. 17% discount is too good to be true.
@op Have you thought about using a mixing service, if not, click UniJoin link in my signature.